[NSRCA-discussion] SODA BOTTLE FUEL TANK

[RCSkyraidr at aol.com]

Hello everyone,
 
I just could not resist adding my 1.75 cents to this discussion. I have  been 
flying an airplane, an original design trainer called The Professor, since  
1978 using the same 2-liter coke bottle for a fuel tank. I use a neoprene  
stopper I stole from a Chem lab back then but any of the current glow fuel tank  
stoppers would also work. The assembly still works fine.
 
I don't understand about the "shrinkage" reported here. Have the plastics  
used in soda bottles changed that much since 1978? My fuel bottle still holds  
about 64 oz. of fuel. There has been no shrinkage and the big tank remains in  
great health. The tank is supported in the front and rear and locked in place 
by  a plywood bar.
 
BTW - The engine is a K & B 61 equipped with a "Perry Regulated  Pump" so 
fuel draw is constant. Takeoff weight is 14.5 lb. and landing weight is  10.5 lb. 
This aircraft has been known to teach new pilots to fly RC in just one  
weekend. Each flight lasts 2 hours but we usually had 5-minute breaks every  15 
minutes.
 
Best regards,
 
Frank Granelli
NSRCA 1958  
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